1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * NES, SNES, N64, MultiSystem, PSX gamepad driver for Linux
4 *
5 * Copyright (c) 1999-2004 Vojtech Pavlik <vojtech@suse.cz>
6 * Copyright (c) 2004 Peter Nelson <rufus-kernel@hackish.org>
7 *
8 * Based on the work of:
9 * Andree Borrmann John Dahlstrom
10 * David Kuder Nathan Hand
11 * Raphael Assenat
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/parport.h>
21 #include <linux/input.h>
22 #include <linux/mutex.h>
23 #include <linux/slab.h>
24
25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
26 MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
27 MODULE_LICENSE("GPL");
28
29 #define GC_MAX_PORTS 3
30 #define GC_MAX_DEVICES 5
31
32 struct gc_config {
33 int args[GC_MAX_DEVICES + 1];
34 unsigned int nargs;
35 };
36
37 static struct gc_config gc_cfg[GC_MAX_PORTS];
38
39 module_param_array_named(map, gc_cfg[0].args, int, &gc_cfg[0].nargs, 0);
40 MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<pad1>,<pad2>,..<pad5>)");
41 module_param_array_named(map2, gc_cfg[1].args, int, &gc_cfg[1].nargs, 0);
42 MODULE_PARM_DESC(map2, "Describes second set of devices");
43 module_param_array_named(map3, gc_cfg[2].args, int, &gc_cfg[2].nargs, 0);
44 MODULE_PARM_DESC(map3, "Describes third set of devices");
45
46 /* see also gs_psx_delay parameter in PSX support section */
47
48 enum gc_type {
49 GC_NONE = 0,
50 GC_SNES,
51 GC_NES,
52 GC_NES4,
53 GC_MULTI,
54 GC_MULTI2,
55 GC_N64,
56 GC_PSX,
57 GC_DDR,
58 GC_SNESMOUSE,
59 GC_MAX
60 };
61
62 #define GC_REFRESH_TIME HZ/100
63
64 struct gc_pad {
65 struct input_dev *dev;
66 enum gc_type type;
67 char phys[32];
68 };
69
70 struct gc {
71 struct pardevice *pd;
72 struct gc_pad pads[GC_MAX_DEVICES];
73 struct timer_list timer;
74 int pad_count[GC_MAX];
75 int used;
76 int parportno;
77 struct mutex mutex;
78 };
79
80 struct gc_subdev {
81 unsigned int idx;
82 };
83
84 static struct gc *gc_base[3];
85
86 static const int gc_status_bit[] = { 0x40, 0x80, 0x20, 0x10, 0x08 };
87
88 static const char *gc_names[] = {
89 NULL, "SNES pad", "NES pad", "NES FourPort", "Multisystem joystick",
90 "Multisystem 2-button joystick", "N64 controller", "PSX controller",
91 "PSX DDR controller", "SNES mouse"
92 };
93
94 /*
95 * N64 support.
96 */
97
98 static const unsigned char gc_n64_bytes[] = { 0, 1, 13, 15, 14, 12, 10, 11, 2, 3 };
99 static const short gc_n64_btn[] = {
100 BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z,
101 BTN_TL, BTN_TR, BTN_TRIGGER, BTN_START
102 };
103
104 #define GC_N64_LENGTH 32 /* N64 bit length, not including stop bit */
105 #define GC_N64_STOP_LENGTH 5 /* Length of encoded stop bit */
106 #define GC_N64_CMD_00 0x11111111UL
107 #define GC_N64_CMD_01 0xd1111111UL
108 #define GC_N64_CMD_03 0xdd111111UL
109 #define GC_N64_CMD_1b 0xdd1dd111UL
110 #define GC_N64_CMD_c0 0x111111ddUL
111 #define GC_N64_CMD_80 0x1111111dUL
112 #define GC_N64_STOP_BIT 0x1d /* Encoded stop bit */
113 #define GC_N64_REQUEST_DATA GC_N64_CMD_01 /* the request data command */
114 #define GC_N64_DELAY 133 /* delay between transmit request, and response ready (us) */
115 #define GC_N64_DWS 3 /* delay between write segments (required for sound playback because of ISA DMA) */
116 /* GC_N64_DWS > 24 is known to fail */
117 #define GC_N64_POWER_W 0xe2 /* power during write (transmit request) */
118 #define GC_N64_POWER_R 0xfd /* power during read */
119 #define GC_N64_OUT 0x1d /* output bits to the 4 pads */
120 /* Reading the main axes of any N64 pad is known to fail if the corresponding bit */
121 /* in GC_N64_OUT is pulled low on the output port (by any routine) for more */
122 /* than 123 us */
123 #define GC_N64_CLOCK 0x02 /* clock bits for read */
124
125 /*
126 * Used for rumble code.
127 */
128
129 /* Send encoded command */
gc_n64_send_command(struct gc * gc,unsigned long cmd,unsigned char target)130 static void gc_n64_send_command(struct gc *gc, unsigned long cmd,
131 unsigned char target)
132 {
133 struct parport *port = gc->pd->port;
134 int i;
135
136 for (i = 0; i < GC_N64_LENGTH; i++) {
137 unsigned char data = (cmd >> i) & 1 ? target : 0;
138 parport_write_data(port, GC_N64_POWER_W | data);
139 udelay(GC_N64_DWS);
140 }
141 }
142
143 /* Send stop bit */
gc_n64_send_stop_bit(struct gc * gc,unsigned char target)144 static void gc_n64_send_stop_bit(struct gc *gc, unsigned char target)
145 {
146 struct parport *port = gc->pd->port;
147 int i;
148
149 for (i = 0; i < GC_N64_STOP_LENGTH; i++) {
150 unsigned char data = (GC_N64_STOP_BIT >> i) & 1 ? target : 0;
151 parport_write_data(port, GC_N64_POWER_W | data);
152 udelay(GC_N64_DWS);
153 }
154 }
155
156 /*
157 * gc_n64_read_packet() reads an N64 packet.
158 * Each pad uses one bit per byte. So all pads connected to this port
159 * are read in parallel.
160 */
161
gc_n64_read_packet(struct gc * gc,unsigned char * data)162 static void gc_n64_read_packet(struct gc *gc, unsigned char *data)
163 {
164 int i;
165 unsigned long flags;
166
167 /*
168 * Request the pad to transmit data
169 */
170
171 local_irq_save(flags);
172 gc_n64_send_command(gc, GC_N64_REQUEST_DATA, GC_N64_OUT);
173 gc_n64_send_stop_bit(gc, GC_N64_OUT);
174 local_irq_restore(flags);
175
176 /*
177 * Wait for the pad response to be loaded into the 33-bit register
178 * of the adapter.
179 */
180
181 udelay(GC_N64_DELAY);
182
183 /*
184 * Grab data (ignoring the last bit, which is a stop bit)
185 */
186
187 for (i = 0; i < GC_N64_LENGTH; i++) {
188 parport_write_data(gc->pd->port, GC_N64_POWER_R);
189 udelay(2);
190 data[i] = parport_read_status(gc->pd->port);
191 parport_write_data(gc->pd->port, GC_N64_POWER_R | GC_N64_CLOCK);
192 }
193
194 /*
195 * We must wait 200 ms here for the controller to reinitialize before
196 * the next read request. No worries as long as gc_read is polled less
197 * frequently than this.
198 */
199
200 }
201
gc_n64_process_packet(struct gc * gc)202 static void gc_n64_process_packet(struct gc *gc)
203 {
204 unsigned char data[GC_N64_LENGTH];
205 struct input_dev *dev;
206 int i, j, s;
207 signed char x, y;
208
209 gc_n64_read_packet(gc, data);
210
211 for (i = 0; i < GC_MAX_DEVICES; i++) {
212
213 if (gc->pads[i].type != GC_N64)
214 continue;
215
216 dev = gc->pads[i].dev;
217 s = gc_status_bit[i];
218
219 if (s & ~(data[8] | data[9])) {
220
221 x = y = 0;
222
223 for (j = 0; j < 8; j++) {
224 if (data[23 - j] & s)
225 x |= 1 << j;
226 if (data[31 - j] & s)
227 y |= 1 << j;
228 }
229
230 input_report_abs(dev, ABS_X, x);
231 input_report_abs(dev, ABS_Y, -y);
232
233 input_report_abs(dev, ABS_HAT0X,
234 !(s & data[6]) - !(s & data[7]));
235 input_report_abs(dev, ABS_HAT0Y,
236 !(s & data[4]) - !(s & data[5]));
237
238 for (j = 0; j < 10; j++)
239 input_report_key(dev, gc_n64_btn[j],
240 s & data[gc_n64_bytes[j]]);
241
242 input_sync(dev);
243 }
244 }
245 }
246
gc_n64_play_effect(struct input_dev * dev,void * data,struct ff_effect * effect)247 static int gc_n64_play_effect(struct input_dev *dev, void *data,
248 struct ff_effect *effect)
249 {
250 int i;
251 unsigned long flags;
252 struct gc *gc = input_get_drvdata(dev);
253 struct gc_subdev *sdev = data;
254 unsigned char target = 1 << sdev->idx; /* select desired pin */
255
256 if (effect->type == FF_RUMBLE) {
257 struct ff_rumble_effect *rumble = &effect->u.rumble;
258 unsigned int cmd =
259 rumble->strong_magnitude || rumble->weak_magnitude ?
260 GC_N64_CMD_01 : GC_N64_CMD_00;
261
262 local_irq_save(flags);
263
264 /* Init Rumble - 0x03, 0x80, 0x01, (34)0x80 */
265 gc_n64_send_command(gc, GC_N64_CMD_03, target);
266 gc_n64_send_command(gc, GC_N64_CMD_80, target);
267 gc_n64_send_command(gc, GC_N64_CMD_01, target);
268 for (i = 0; i < 32; i++)
269 gc_n64_send_command(gc, GC_N64_CMD_80, target);
270 gc_n64_send_stop_bit(gc, target);
271
272 udelay(GC_N64_DELAY);
273
274 /* Now start or stop it - 0x03, 0xc0, 0zx1b, (32)0x01/0x00 */
275 gc_n64_send_command(gc, GC_N64_CMD_03, target);
276 gc_n64_send_command(gc, GC_N64_CMD_c0, target);
277 gc_n64_send_command(gc, GC_N64_CMD_1b, target);
278 for (i = 0; i < 32; i++)
279 gc_n64_send_command(gc, cmd, target);
280 gc_n64_send_stop_bit(gc, target);
281
282 local_irq_restore(flags);
283
284 }
285
286 return 0;
287 }
288
gc_n64_init_ff(struct input_dev * dev,int i)289 static int gc_n64_init_ff(struct input_dev *dev, int i)
290 {
291 struct gc_subdev *sdev;
292 int err;
293
294 sdev = kmalloc(sizeof(*sdev), GFP_KERNEL);
295 if (!sdev)
296 return -ENOMEM;
297
298 sdev->idx = i;
299
300 input_set_capability(dev, EV_FF, FF_RUMBLE);
301
302 err = input_ff_create_memless(dev, sdev, gc_n64_play_effect);
303 if (err) {
304 kfree(sdev);
305 return err;
306 }
307
308 return 0;
309 }
310
311 /*
312 * NES/SNES support.
313 */
314
315 #define GC_NES_DELAY 6 /* Delay between bits - 6us */
316 #define GC_NES_LENGTH 8 /* The NES pads use 8 bits of data */
317 #define GC_SNES_LENGTH 12 /* The SNES true length is 16, but the
318 last 4 bits are unused */
319 #define GC_SNESMOUSE_LENGTH 32 /* The SNES mouse uses 32 bits, the first
320 16 bits are equivalent to a gamepad */
321
322 #define GC_NES_POWER 0xfc
323 #define GC_NES_CLOCK 0x01
324 #define GC_NES_LATCH 0x02
325
326 static const unsigned char gc_nes_bytes[] = { 0, 1, 2, 3 };
327 static const unsigned char gc_snes_bytes[] = { 8, 0, 2, 3, 9, 1, 10, 11 };
328 static const short gc_snes_btn[] = {
329 BTN_A, BTN_B, BTN_SELECT, BTN_START, BTN_X, BTN_Y, BTN_TL, BTN_TR
330 };
331
332 /*
333 * gc_nes_read_packet() reads a NES/SNES packet.
334 * Each pad uses one bit per byte. So all pads connected to
335 * this port are read in parallel.
336 */
337
gc_nes_read_packet(struct gc * gc,int length,unsigned char * data)338 static void gc_nes_read_packet(struct gc *gc, int length, unsigned char *data)
339 {
340 int i;
341
342 parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK | GC_NES_LATCH);
343 udelay(GC_NES_DELAY * 2);
344 parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
345
346 for (i = 0; i < length; i++) {
347 udelay(GC_NES_DELAY);
348 parport_write_data(gc->pd->port, GC_NES_POWER);
349 data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
350 udelay(GC_NES_DELAY);
351 parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
352 }
353 }
354
gc_nes_process_packet(struct gc * gc)355 static void gc_nes_process_packet(struct gc *gc)
356 {
357 unsigned char data[GC_SNESMOUSE_LENGTH];
358 struct gc_pad *pad;
359 struct input_dev *dev;
360 int i, j, s, len;
361 char x_rel, y_rel;
362
363 len = gc->pad_count[GC_SNESMOUSE] ? GC_SNESMOUSE_LENGTH :
364 (gc->pad_count[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH);
365
366 gc_nes_read_packet(gc, len, data);
367
368 for (i = 0; i < GC_MAX_DEVICES; i++) {
369
370 pad = &gc->pads[i];
371 dev = pad->dev;
372 s = gc_status_bit[i];
373
374 switch (pad->type) {
375
376 case GC_NES:
377
378 input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
379 input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));
380
381 for (j = 0; j < 4; j++)
382 input_report_key(dev, gc_snes_btn[j],
383 s & data[gc_nes_bytes[j]]);
384 input_sync(dev);
385 break;
386
387 case GC_SNES:
388
389 input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
390 input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));
391
392 for (j = 0; j < 8; j++)
393 input_report_key(dev, gc_snes_btn[j],
394 s & data[gc_snes_bytes[j]]);
395 input_sync(dev);
396 break;
397
398 case GC_SNESMOUSE:
399 /*
400 * The 4 unused bits from SNES controllers appear
401 * to be ID bits so use them to make sure we are
402 * dealing with a mouse.
403 * gamepad is connected. This is important since
404 * my SNES gamepad sends 1's for bits 16-31, which
405 * cause the mouse pointer to quickly move to the
406 * upper left corner of the screen.
407 */
408 if (!(s & data[12]) && !(s & data[13]) &&
409 !(s & data[14]) && (s & data[15])) {
410 input_report_key(dev, BTN_LEFT, s & data[9]);
411 input_report_key(dev, BTN_RIGHT, s & data[8]);
412
413 x_rel = y_rel = 0;
414 for (j = 0; j < 7; j++) {
415 x_rel <<= 1;
416 if (data[25 + j] & s)
417 x_rel |= 1;
418
419 y_rel <<= 1;
420 if (data[17 + j] & s)
421 y_rel |= 1;
422 }
423
424 if (x_rel) {
425 if (data[24] & s)
426 x_rel = -x_rel;
427 input_report_rel(dev, REL_X, x_rel);
428 }
429
430 if (y_rel) {
431 if (data[16] & s)
432 y_rel = -y_rel;
433 input_report_rel(dev, REL_Y, y_rel);
434 }
435
436 input_sync(dev);
437 }
438 break;
439
440 default:
441 break;
442 }
443 }
444 }
445
446 /*
447 * Multisystem joystick support
448 */
449
450 #define GC_MULTI_LENGTH 5 /* Multi system joystick packet length is 5 */
451 #define GC_MULTI2_LENGTH 6 /* One more bit for one more button */
452
453 /*
454 * gc_multi_read_packet() reads a Multisystem joystick packet.
455 */
456
gc_multi_read_packet(struct gc * gc,int length,unsigned char * data)457 static void gc_multi_read_packet(struct gc *gc, int length, unsigned char *data)
458 {
459 int i;
460
461 for (i = 0; i < length; i++) {
462 parport_write_data(gc->pd->port, ~(1 << i));
463 data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
464 }
465 }
466
gc_multi_process_packet(struct gc * gc)467 static void gc_multi_process_packet(struct gc *gc)
468 {
469 unsigned char data[GC_MULTI2_LENGTH];
470 int data_len = gc->pad_count[GC_MULTI2] ? GC_MULTI2_LENGTH : GC_MULTI_LENGTH;
471 struct gc_pad *pad;
472 struct input_dev *dev;
473 int i, s;
474
475 gc_multi_read_packet(gc, data_len, data);
476
477 for (i = 0; i < GC_MAX_DEVICES; i++) {
478 pad = &gc->pads[i];
479 dev = pad->dev;
480 s = gc_status_bit[i];
481
482 switch (pad->type) {
483 case GC_MULTI2:
484 input_report_key(dev, BTN_THUMB, s & data[5]);
485 fallthrough;
486
487 case GC_MULTI:
488 input_report_abs(dev, ABS_X,
489 !(s & data[2]) - !(s & data[3]));
490 input_report_abs(dev, ABS_Y,
491 !(s & data[0]) - !(s & data[1]));
492 input_report_key(dev, BTN_TRIGGER, s & data[4]);
493 input_sync(dev);
494 break;
495
496 default:
497 break;
498 }
499 }
500 }
501
502 /*
503 * PSX support
504 *
505 * See documentation at:
506 * http://www.geocities.co.jp/Playtown/2004/psx/ps_eng.txt
507 * http://www.gamesx.com/controldata/psxcont/psxcont.htm
508 *
509 */
510
511 #define GC_PSX_DELAY 25 /* 25 usec */
512 #define GC_PSX_LENGTH 8 /* talk to the controller in bits */
513 #define GC_PSX_BYTES 6 /* the maximum number of bytes to read off the controller */
514
515 #define GC_PSX_MOUSE 1 /* Mouse */
516 #define GC_PSX_NEGCON 2 /* NegCon */
517 #define GC_PSX_NORMAL 4 /* Digital / Analog or Rumble in Digital mode */
518 #define GC_PSX_ANALOG 5 /* Analog in Analog mode / Rumble in Green mode */
519 #define GC_PSX_RUMBLE 7 /* Rumble in Red mode */
520
521 #define GC_PSX_CLOCK 0x04 /* Pin 4 */
522 #define GC_PSX_COMMAND 0x01 /* Pin 2 */
523 #define GC_PSX_POWER 0xf8 /* Pins 5-9 */
524 #define GC_PSX_SELECT 0x02 /* Pin 3 */
525
526 #define GC_PSX_ID(x) ((x) >> 4) /* High nibble is device type */
527 #define GC_PSX_LEN(x) (((x) & 0xf) << 1) /* Low nibble is length in bytes/2 */
528
529 static int gc_psx_delay = GC_PSX_DELAY;
530 module_param_named(psx_delay, gc_psx_delay, uint, 0);
531 MODULE_PARM_DESC(psx_delay, "Delay when accessing Sony PSX controller (usecs)");
532
533 static const short gc_psx_abs[] = {
534 ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y
535 };
536 static const short gc_psx_btn[] = {
537 BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
538 BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR
539 };
540 static const short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };
541
542 /*
543 * gc_psx_command() writes 8bit command and reads 8bit data from
544 * the psx pad.
545 */
546
gc_psx_command(struct gc * gc,int b,unsigned char * data)547 static void gc_psx_command(struct gc *gc, int b, unsigned char *data)
548 {
549 struct parport *port = gc->pd->port;
550 int i, j, cmd, read;
551
552 memset(data, 0, GC_MAX_DEVICES);
553
554 for (i = 0; i < GC_PSX_LENGTH; i++, b >>= 1) {
555 cmd = (b & 1) ? GC_PSX_COMMAND : 0;
556 parport_write_data(port, cmd | GC_PSX_POWER);
557 udelay(gc_psx_delay);
558
559 read = parport_read_status(port) ^ 0x80;
560
561 for (j = 0; j < GC_MAX_DEVICES; j++) {
562 struct gc_pad *pad = &gc->pads[j];
563
564 if (pad->type == GC_PSX || pad->type == GC_DDR)
565 data[j] |= (read & gc_status_bit[j]) ? (1 << i) : 0;
566 }
567
568 parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
569 udelay(gc_psx_delay);
570 }
571 }
572
573 /*
574 * gc_psx_read_packet() reads a whole psx packet and returns
575 * device identifier code.
576 */
577
gc_psx_read_packet(struct gc * gc,unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES],unsigned char id[GC_MAX_DEVICES])578 static void gc_psx_read_packet(struct gc *gc,
579 unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES],
580 unsigned char id[GC_MAX_DEVICES])
581 {
582 int i, j, max_len = 0;
583 unsigned long flags;
584 unsigned char data2[GC_MAX_DEVICES];
585
586 /* Select pad */
587 parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
588 udelay(gc_psx_delay);
589 /* Deselect, begin command */
590 parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER);
591 udelay(gc_psx_delay);
592
593 local_irq_save(flags);
594
595 gc_psx_command(gc, 0x01, data2); /* Access pad */
596 gc_psx_command(gc, 0x42, id); /* Get device ids */
597 gc_psx_command(gc, 0, data2); /* Dump status */
598
599 /* Find the longest pad */
600 for (i = 0; i < GC_MAX_DEVICES; i++) {
601 struct gc_pad *pad = &gc->pads[i];
602
603 if ((pad->type == GC_PSX || pad->type == GC_DDR) &&
604 GC_PSX_LEN(id[i]) > max_len &&
605 GC_PSX_LEN(id[i]) <= GC_PSX_BYTES) {
606 max_len = GC_PSX_LEN(id[i]);
607 }
608 }
609
610 /* Read in all the data */
611 for (i = 0; i < max_len; i++) {
612 gc_psx_command(gc, 0, data2);
613 for (j = 0; j < GC_MAX_DEVICES; j++)
614 data[j][i] = data2[j];
615 }
616
617 local_irq_restore(flags);
618
619 parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
620
621 /* Set id's to the real value */
622 for (i = 0; i < GC_MAX_DEVICES; i++)
623 id[i] = GC_PSX_ID(id[i]);
624 }
625
gc_psx_report_one(struct gc_pad * pad,unsigned char psx_type,unsigned char * data)626 static void gc_psx_report_one(struct gc_pad *pad, unsigned char psx_type,
627 unsigned char *data)
628 {
629 struct input_dev *dev = pad->dev;
630 int i;
631
632 switch (psx_type) {
633
634 case GC_PSX_RUMBLE:
635
636 input_report_key(dev, BTN_THUMBL, ~data[0] & 0x04);
637 input_report_key(dev, BTN_THUMBR, ~data[0] & 0x02);
638 fallthrough;
639
640 case GC_PSX_NEGCON:
641 case GC_PSX_ANALOG:
642
643 if (pad->type == GC_DDR) {
644 for (i = 0; i < 4; i++)
645 input_report_key(dev, gc_psx_ddr_btn[i],
646 ~data[0] & (0x10 << i));
647 } else {
648 for (i = 0; i < 4; i++)
649 input_report_abs(dev, gc_psx_abs[i + 2],
650 data[i + 2]);
651
652 input_report_abs(dev, ABS_X,
653 !!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
654 input_report_abs(dev, ABS_Y,
655 !!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);
656 }
657
658 for (i = 0; i < 8; i++)
659 input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));
660
661 input_report_key(dev, BTN_START, ~data[0] & 0x08);
662 input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);
663
664 input_sync(dev);
665
666 break;
667
668 case GC_PSX_NORMAL:
669
670 if (pad->type == GC_DDR) {
671 for (i = 0; i < 4; i++)
672 input_report_key(dev, gc_psx_ddr_btn[i],
673 ~data[0] & (0x10 << i));
674 } else {
675 input_report_abs(dev, ABS_X,
676 !!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
677 input_report_abs(dev, ABS_Y,
678 !!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);
679
680 /*
681 * For some reason if the extra axes are left unset
682 * they drift.
683 * for (i = 0; i < 4; i++)
684 input_report_abs(dev, gc_psx_abs[i + 2], 128);
685 * This needs to be debugged properly,
686 * maybe fuzz processing needs to be done
687 * in input_sync()
688 * --vojtech
689 */
690 }
691
692 for (i = 0; i < 8; i++)
693 input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));
694
695 input_report_key(dev, BTN_START, ~data[0] & 0x08);
696 input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);
697
698 input_sync(dev);
699
700 break;
701
702 default: /* not a pad, ignore */
703 break;
704 }
705 }
706
gc_psx_process_packet(struct gc * gc)707 static void gc_psx_process_packet(struct gc *gc)
708 {
709 unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES];
710 unsigned char id[GC_MAX_DEVICES];
711 struct gc_pad *pad;
712 int i;
713
714 gc_psx_read_packet(gc, data, id);
715
716 for (i = 0; i < GC_MAX_DEVICES; i++) {
717 pad = &gc->pads[i];
718 if (pad->type == GC_PSX || pad->type == GC_DDR)
719 gc_psx_report_one(pad, id[i], data[i]);
720 }
721 }
722
723 /*
724 * gc_timer() initiates reads of console pads data.
725 */
726
gc_timer(struct timer_list * t)727 static void gc_timer(struct timer_list *t)
728 {
729 struct gc *gc = from_timer(gc, t, timer);
730
731 /*
732 * N64 pads - must be read first, any read confuses them for 200 us
733 */
734
735 if (gc->pad_count[GC_N64])
736 gc_n64_process_packet(gc);
737
738 /*
739 * NES and SNES pads or mouse
740 */
741
742 if (gc->pad_count[GC_NES] ||
743 gc->pad_count[GC_SNES] ||
744 gc->pad_count[GC_SNESMOUSE]) {
745 gc_nes_process_packet(gc);
746 }
747
748 /*
749 * Multi and Multi2 joysticks
750 */
751
752 if (gc->pad_count[GC_MULTI] || gc->pad_count[GC_MULTI2])
753 gc_multi_process_packet(gc);
754
755 /*
756 * PSX controllers
757 */
758
759 if (gc->pad_count[GC_PSX] || gc->pad_count[GC_DDR])
760 gc_psx_process_packet(gc);
761
762 mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
763 }
764
gc_open(struct input_dev * dev)765 static int gc_open(struct input_dev *dev)
766 {
767 struct gc *gc = input_get_drvdata(dev);
768 int err;
769
770 err = mutex_lock_interruptible(&gc->mutex);
771 if (err)
772 return err;
773
774 if (!gc->used++) {
775 parport_claim(gc->pd);
776 parport_write_control(gc->pd->port, 0x04);
777 mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
778 }
779
780 mutex_unlock(&gc->mutex);
781 return 0;
782 }
783
gc_close(struct input_dev * dev)784 static void gc_close(struct input_dev *dev)
785 {
786 struct gc *gc = input_get_drvdata(dev);
787
788 mutex_lock(&gc->mutex);
789 if (!--gc->used) {
790 del_timer_sync(&gc->timer);
791 parport_write_control(gc->pd->port, 0x00);
792 parport_release(gc->pd);
793 }
794 mutex_unlock(&gc->mutex);
795 }
796
gc_setup_pad(struct gc * gc,int idx,int pad_type)797 static int gc_setup_pad(struct gc *gc, int idx, int pad_type)
798 {
799 struct gc_pad *pad = &gc->pads[idx];
800 struct input_dev *input_dev;
801 int i;
802 int err;
803
804 if (pad_type < 1 || pad_type >= GC_MAX) {
805 pr_err("Pad type %d unknown\n", pad_type);
806 return -EINVAL;
807 }
808
809 pad->dev = input_dev = input_allocate_device();
810 if (!input_dev) {
811 pr_err("Not enough memory for input device\n");
812 return -ENOMEM;
813 }
814
815 pad->type = pad_type;
816
817 snprintf(pad->phys, sizeof(pad->phys),
818 "%s/input%d", gc->pd->port->name, idx);
819
820 input_dev->name = gc_names[pad_type];
821 input_dev->phys = pad->phys;
822 input_dev->id.bustype = BUS_PARPORT;
823 input_dev->id.vendor = 0x0001;
824 input_dev->id.product = pad_type;
825 input_dev->id.version = 0x0100;
826
827 input_set_drvdata(input_dev, gc);
828
829 input_dev->open = gc_open;
830 input_dev->close = gc_close;
831
832 if (pad_type != GC_SNESMOUSE) {
833 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
834
835 for (i = 0; i < 2; i++)
836 input_set_abs_params(input_dev, ABS_X + i, -1, 1, 0, 0);
837 } else
838 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
839
840 gc->pad_count[pad_type]++;
841
842 switch (pad_type) {
843
844 case GC_N64:
845 for (i = 0; i < 10; i++)
846 input_set_capability(input_dev, EV_KEY, gc_n64_btn[i]);
847
848 for (i = 0; i < 2; i++) {
849 input_set_abs_params(input_dev, ABS_X + i, -127, 126, 0, 2);
850 input_set_abs_params(input_dev, ABS_HAT0X + i, -1, 1, 0, 0);
851 }
852
853 err = gc_n64_init_ff(input_dev, idx);
854 if (err) {
855 pr_warn("Failed to initiate rumble for N64 device %d\n",
856 idx);
857 goto err_free_dev;
858 }
859
860 break;
861
862 case GC_SNESMOUSE:
863 input_set_capability(input_dev, EV_KEY, BTN_LEFT);
864 input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
865 input_set_capability(input_dev, EV_REL, REL_X);
866 input_set_capability(input_dev, EV_REL, REL_Y);
867 break;
868
869 case GC_SNES:
870 for (i = 4; i < 8; i++)
871 input_set_capability(input_dev, EV_KEY, gc_snes_btn[i]);
872 fallthrough;
873
874 case GC_NES:
875 for (i = 0; i < 4; i++)
876 input_set_capability(input_dev, EV_KEY, gc_snes_btn[i]);
877 break;
878
879 case GC_MULTI2:
880 input_set_capability(input_dev, EV_KEY, BTN_THUMB);
881 fallthrough;
882
883 case GC_MULTI:
884 input_set_capability(input_dev, EV_KEY, BTN_TRIGGER);
885 break;
886
887 case GC_PSX:
888 for (i = 0; i < 6; i++)
889 input_set_abs_params(input_dev,
890 gc_psx_abs[i], 4, 252, 0, 2);
891 for (i = 0; i < 12; i++)
892 input_set_capability(input_dev, EV_KEY, gc_psx_btn[i]);
893 break;
894
895 break;
896
897 case GC_DDR:
898 for (i = 0; i < 4; i++)
899 input_set_capability(input_dev, EV_KEY,
900 gc_psx_ddr_btn[i]);
901 for (i = 0; i < 12; i++)
902 input_set_capability(input_dev, EV_KEY, gc_psx_btn[i]);
903
904 break;
905 }
906
907 err = input_register_device(pad->dev);
908 if (err)
909 goto err_free_dev;
910
911 return 0;
912
913 err_free_dev:
914 input_free_device(pad->dev);
915 pad->dev = NULL;
916 return err;
917 }
918
gc_attach(struct parport * pp)919 static void gc_attach(struct parport *pp)
920 {
921 struct gc *gc;
922 struct pardevice *pd;
923 int i, port_idx;
924 int count = 0;
925 int *pads, n_pads;
926 struct pardev_cb gc_parport_cb;
927
928 for (port_idx = 0; port_idx < GC_MAX_PORTS; port_idx++) {
929 if (gc_cfg[port_idx].nargs == 0 || gc_cfg[port_idx].args[0] < 0)
930 continue;
931
932 if (gc_cfg[port_idx].args[0] == pp->number)
933 break;
934 }
935
936 if (port_idx == GC_MAX_PORTS) {
937 pr_debug("Not using parport%d.\n", pp->number);
938 return;
939 }
940 pads = gc_cfg[port_idx].args + 1;
941 n_pads = gc_cfg[port_idx].nargs - 1;
942
943 memset(&gc_parport_cb, 0, sizeof(gc_parport_cb));
944 gc_parport_cb.flags = PARPORT_FLAG_EXCL;
945
946 pd = parport_register_dev_model(pp, "gamecon", &gc_parport_cb,
947 port_idx);
948 if (!pd) {
949 pr_err("parport busy already - lp.o loaded?\n");
950 return;
951 }
952
953 gc = kzalloc(sizeof(struct gc), GFP_KERNEL);
954 if (!gc) {
955 pr_err("Not enough memory\n");
956 goto err_unreg_pardev;
957 }
958
959 mutex_init(&gc->mutex);
960 gc->pd = pd;
961 gc->parportno = pp->number;
962 timer_setup(&gc->timer, gc_timer, 0);
963
964 for (i = 0; i < n_pads && i < GC_MAX_DEVICES; i++) {
965 if (!pads[i])
966 continue;
967
968 if (gc_setup_pad(gc, i, pads[i]))
969 goto err_unreg_devs;
970
971 count++;
972 }
973
974 if (count == 0) {
975 pr_err("No valid devices specified\n");
976 goto err_free_gc;
977 }
978
979 gc_base[port_idx] = gc;
980 return;
981
982 err_unreg_devs:
983 while (--i >= 0)
984 if (gc->pads[i].dev)
985 input_unregister_device(gc->pads[i].dev);
986 err_free_gc:
987 kfree(gc);
988 err_unreg_pardev:
989 parport_unregister_device(pd);
990 }
991
gc_detach(struct parport * port)992 static void gc_detach(struct parport *port)
993 {
994 int i;
995 struct gc *gc;
996
997 for (i = 0; i < GC_MAX_PORTS; i++) {
998 if (gc_base[i] && gc_base[i]->parportno == port->number)
999 break;
1000 }
1001
1002 if (i == GC_MAX_PORTS)
1003 return;
1004
1005 gc = gc_base[i];
1006 gc_base[i] = NULL;
1007
1008 for (i = 0; i < GC_MAX_DEVICES; i++)
1009 if (gc->pads[i].dev)
1010 input_unregister_device(gc->pads[i].dev);
1011 parport_unregister_device(gc->pd);
1012 kfree(gc);
1013 }
1014
1015 static struct parport_driver gc_parport_driver = {
1016 .name = "gamecon",
1017 .match_port = gc_attach,
1018 .detach = gc_detach,
1019 .devmodel = true,
1020 };
1021
gc_init(void)1022 static int __init gc_init(void)
1023 {
1024 int i;
1025 int have_dev = 0;
1026
1027 for (i = 0; i < GC_MAX_PORTS; i++) {
1028 if (gc_cfg[i].nargs == 0 || gc_cfg[i].args[0] < 0)
1029 continue;
1030
1031 if (gc_cfg[i].nargs < 2) {
1032 pr_err("at least one device must be specified\n");
1033 return -EINVAL;
1034 }
1035
1036 have_dev = 1;
1037 }
1038
1039 if (!have_dev)
1040 return -ENODEV;
1041
1042 return parport_register_driver(&gc_parport_driver);
1043 }
1044
gc_exit(void)1045 static void __exit gc_exit(void)
1046 {
1047 parport_unregister_driver(&gc_parport_driver);
1048 }
1049
1050 module_init(gc_init);
1051 module_exit(gc_exit);
1052